Disable checkstyle Indentation for a certain token

I'm using clang-format with checkstyle in Java project and having an issue with Lambda indentation

Specifically - due to clang-format Java limitations in certain scenarios my lambdas are formatted as follows:

    IntStream.range(0, numberOfPartitions)
        .forEach(
            i
            -> this.flushConsumer.accept(  // <- Issue here
                eventList.stream().skip(i * partitionSize).limit(partitionSize).collect(Collectors.toSet())
            )
        );

In that case the indent is not inserted before the -> and that triggers checkstyle indentation error due to the configuration being:

<module name="Indentation">
    <property name="basicOffset" value="4"/>
    <property name="braceAdjustment" value="4"/>
    <property name="caseIndent" value="4"/>
    <property name="throwsIndent" value="4"/>
    <property name="lineWrappingIndentation" value="4"/>
    <property name="arrayInitIndent" value="4"/>
</module>

The issue is - according to Checkstyle docs there doesn't seem to be any valid way to suppress this error using LAMBDA token or regexp ignorePattern for <module name="Indentation">

The only way I found - is to have SuppressionCommentFilter, which makes it ugly to insert everywhere or write a custom checkstyle check, which is complicated and doesn't work with some code editors

Question: Is there any known way or at least a simple workaround to suppress the error in that case?

Solution

You can use SuppressionXpathFilter to suppress the violation reported by Indentation check for LAMBDA token:

Suppression filter file (suppressions-ind.xml):

<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
        "-//Checkstyle//DTD SuppressionXpathFilter Experimental Configuration 1.2//EN"
        "https://checkstyle.org/dtds/suppressions_1_2_xpath_experimental.dtd">
<suppressions>
    <suppress-xpath checks="Indentation" query="//LAMBDA"/>
</suppressions>

Checkstyle configuration (referencing the suppression file above):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module
  PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
   <module name="TreeWalker">
      <module name="SuppressionXpathFilter">
        <property name="file" value="suppressions-ind.xml"/>
      </module>
      <module name="Indentation">
         <property name="basicOffset" value="4"/>
         <property name="braceAdjustment" value="4"/>
         <property name="caseIndent" value="4"/>
         <property name="throwsIndent" value="4"/>
         <property name="lineWrappingIndentation" value="4"/>
         <property name="arrayInitIndent" value="4"/>
      </module>
   </module>
</module>